The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 12, 1993
Filed:
Mar. 28, 1990
Yukihiro Ohzeki, Yokohama, JP;
Tatsunori Ishiyama, Yokohama, JP;
Koichi Hiroshima, Yokohama, JP;
Junji Araya, Yokohama, JP;
Yasushi Sato, Kawasaki, JP;
Kimio Nakahata, Kawasaki, JP;
Akihiko Takeuchi, Yokohama, JP;
Takayasu Yuminamochi, Yokohama, JP;
Hiroto Hasegawa, Kawasaki, JP;
Koichi Tanigawa, Tokyo, JP;
Yasumasa Ohtsuka, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming apparatus includes a movable image bearing member; an image forming device for forming a toner image on the image bearing member; image transfer device for transferring the toner image from the image bearing member to a transfer material at an image transfer station, wherein the transfer device includes a charging member press-contacted or faced to the image bearing member and a device for applying a voltage to the charging member, wherein the voltage applying device applies a voltage to the charging member so that the charging member is constant-voltage-controlled when an image region of the image bearing member is in the transfer station, and the charging member is constant-current-controlled during at least a part of a period when it is not in the transfer station, wherein a voltage V2 applied during the constant voltage control is a voltage V1 appearing in the transfer device during the constant current control multiplied by a coefficient R, in which R is larger than 1.